Russia hijacked international sport by using more than 1,000 athletes in an "institutional conspiracy" to win medals at the Sochi and London Olympics and other global events, a top investigator said Friday.

An investigation for the World Anti-Doping Agency (WADA) claims positive tests were concealed at the London Games, the Sochi Winter Olympics, and the 2013 World Athletics Championships. London 2012 was corrupted by Russian athletes on an "unprecedented scale" , said head of the investigation

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